• Types and Advantages and Disadvantages of Thickeners in Waterborne Coatings
    Types and Advantages and Disadvantages of Thickeners in Waterborne Coatings

    2017-10-18

    The dosage of paint additives in the paint is little, but can significantly improve the performance of paint and it has become an indispensable part. Thickener is a rheological additive that not only thickens the coating, prevents sagging in construction, but also gives excellent mechanical properties and storage stability. For the lower viscosity of the water-based paint, it is a very important class of additives. Type of waterborne coating thickener A lot of thickener varieties are available on the market currently, mainly inorganic thickeners, cellulose, polyacrylate and associative polyurethane thickener four categories. Inorganic thickener is a kind of gel mineral that can forming thixotropy by water swelling. Mainly including bentonite, attapulgite, aluminum silicate, etc., of which the most commonly used bentonite. Cellulosic thickeners use a long history, many varieties, with methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, was the main stream of thickeners, One of the most commonly used is hydroxyethyl cellulose. Polyacrylate thickeners can be divided into two types: one is water-soluble polyacrylic acid salt; the other is acrylic acid, methacrylic acid homopolymer or copolymer emulsion thickener, this thickener itself is acidic, with alkali or ammonia to pH8-9 in order to achieve thickening effect, also known as acrylic acid swelling thickener. Polyurethane thickener is a newly developed associative thickener in recent years. The characteristics of various types of thickeners Cellulosic thickeners Cellulosic thickeners have high thickening efficiency, especially for the thickening of the aqueous phase; less restrictions on the coating formulation and wide application; the available pH range is large. But it is poor leveling, roller coating when the phenomenon of more splash, poor stability, vulnerable to microbial degradation and other shortcomings. Because of its low viscosity at high shear, high viscosity in static and low shear, so when the coating is completed, the viscosity increases rapidly, can prevent sagging, but on the other hand,it will caused poor leveling. Studies have shown that the relative molecular mass of the thickener increases and the spatter of the latex coating also increase. Cellulose thickeners are prone to splash due to their relatively high molecular weight. And because the cellulose is better hydrophilic, will reduce the paint film water resistance. Polyacrylic acid thickener Polyacrylic acid thickener has strong thickening and good leveling, good biological stability, but sensitive to pH, poor water resistance. Associated polyurethane thickener The association structure like polyurethane thickener will damage under the action of the shear force, the viscosity decreases. When the force loss, viscosity can be restored, to prevent the sagging phenomenon during construction process. And its viscosity recovery has a certain lag, is conducive to coating smooth. The ...

    read more
  • We to visit Shangchuan Island for two days
    We to visit Shangchuan Island for two days

    2017-10-09

    Anhui SINOGRACE chemical on September 30, 2017, Company employees to visit Shangchuan Island for two days, Came to the beauty of the fishing port, We appreciate the sunset and sunrise, The first taste of wild pineapple, Swimming in the seaside, Looking for a lovely hermit crab on the shore, Follow the fisherman fishing, When the sun was setting, we eat dinner at the seaside. Thank the friends of you all the way there for me, in the National Day, happy birthday to Chinese mother!

    read more
  • Sealing tape, transparent tape, packaging tape, bopp tape, the production process
    Sealing tape, transparent tape, packaging tape, bopp tape, the production process

    2017-10-09

    All kinds of sealing tape, transparent tape, packaging tape, bopp tape products´╝îregardless of its type and use, it is made up of three parts: the substrate (rarely the substrate), the pressure sensitive adhesive, the release paper or the separation film. The production process of sealing tape, transparent tape, packaging tape, bopp tape: The pressure-sensitive adhesive is coated on the corona and release agent-treated substrate or temporary carrier by various methods. After drying and curing, the release paper is rewound into a roll (or without the need for direct release of the release paper) , And then cut into products of the specified size and packaged.

    read more
  • 2017 Orange Warfare Achievements and Summary Sharing Session
    2017 Orange Warfare Achievements and Summary Sharing Session

    2017-09-30

    September 30, 2017, the 45-days orange war ended, every  partners in this war to pay 100% of the effort, made a different victories, our hunter Legion gains prey 924255.83 dollars, war wolf army prey 402731.1 US dollars, although the end of the war, but we never give up, the spirit of teamwork will always be maintained, let us move forward.

    read more

Copyright ┬ę 2015-2017 Anhui Sinograce Chemical Co., Ltd..All Rights Reserved.Powered by dyyseo.com

top